RU15017U1 - DEVICE FOR ESTIMATING SURFACE Roughness AND DETERMINING GEOMETRIC PARAMETERS OF ALL-METAL SAW TAPES (SETS) - Google Patents

Abstract

A device for assessing surface roughness and determining the geometric parameters of all-metal serrated ribbons (headsets), containing a matrix photosensitive surface, characterized in that, in order to improve the accuracy of determining the basic geometric parameters and surface condition of the headsets, reduce time and automate the processing of measurement results at the output of the photosensitive matrix using an analog-to-digital Converter, a digital signal is formed, which is processed using special programs on a computer.

Description

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A device for assessing surface roughness and determining the geometric parameters of all-metal serrated ribbons (sets).

The utility model relates to the textile industry, in particular to the control of surface cleanliness (roughness) and the accuracy of the geometric parameters of all-metal saw tapes (sets used to tighten the working bodies of carding machines and combing rollers of rotor spinning machines), as well as determining the degree of wear.

A known method for determining the roughness of serrated tapes visually by comparison with samples (purity standards corresponding to different roughness classes) using comparison microscopes, light section devices, microinterferometers, scanning measuring microscopes 1. The principle of operation of these devices is reduced to many times the shadow image of the controlled product or the formation of interference (or moire) bands.

The disadvantages of visual control are the inaccuracy of determining the controlled parameters due to diffraction blurring of the edges of the investigated product; high image contrast (the presence of large illuminated and dark areas), leading to rapid operator fatigue; small field of view and a relatively narrow measurement limit.

The use of profilometers and other contact devices using the principle of feeling the surface to be studied is difficult, since the profile of the headset has a complex geometric shape.

The closest to a utility model in terms of technical nature is an opto-electronic device for measuring the edges of structures 2 having a photosensitive surface.

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The disadvantage of this device is the inability to handle a large number of tests, low productivity of the device.

The purpose of the utility model is to increase the accuracy of determining the basic geometric parameters and the state of the surface of the headsets, reduce time and automate the processing of measurement results.

This goal is achieved due to the fact that the photosensitive device, coupled with an analog-to-digital converter, generates digital signals that are processed by a computer.

In FIG. 1 shows a diagram of a device for measuring surface roughness and geometric parameters of headsets.

The essence of the device lies in the fact that the all-metal serrated tape (1), passing through the guide (2), creates a clear shadow), then the projection of the profile on the photosensitive matrix (3), which forms an electrical signal proportional to the illumination converted by analog-digital

ADC converter (4) to digital, which is processed by a microcomputer or computer (5). Due to the digital increase (hundreds of times) on the screen of the video monitoring device (6), the contour of the measured surface is displayed, on which the contour of the nominal (ideal) surface is superimposed. To prevent displacement of the saw blade (1) vertically, a guide (2) is used, which contributes to the correct orientation of the image of this tape (1) relative to the control (ideal) image on the screen (6). The profile of the servo tape can be printed on graph paper using a printer (7).

The device allows real-time registration and storage of information about the controlled and reference objects, and the software calculates the basic parameters of the headsets (total tape height, tooth height.

angles of inclination of the working and front faces of the tooth, the width of the apex and tooth, tooth pitch), parameters characterizing the surface roughness (arithmetic average deviation of the profile, the height of the profile irregularities at ten points, the highest height of the profile irregularities, the average pitch of the irregularities, etc.), the deviation value from a given parameter, statistical characteristics (standard deviation, coefficient of variation, etc.).

When changing the type of controlled tape (1), the device quickly rebuilds by installing new computer software and replacing the guide (2).

The device allows you to quickly and accurately determine the surface roughness and basic geometric parameters of all-metal serrated bands (sets).

Example. An all-metal serrated tape (OK-40) was placed on a matrix of a high-resolution photosensitive scanning device (NxN more than 1, 2-10). Using a digital zoom program, a 1000-fold enlarged image of the contour of a sawtooth strip was displayed on the screen of a video monitoring device. Then, the image of a geometrically correct (ideal) contour was superimposed on the resulting contour, so that the area of deviation of the nominal contraction from the real one was minimal. The coordinates are assigned to each contour point by the calculation program (Xij; Yij for a real contour; Xoij; Yoij for an ideal contour, where i is the number of the controlled point; j is the number of the controlled tooth). The estimation step (the number of points i) and the number of teeth for which the calculation is made are also set. (In our example, control was carried out every 5 points, and a generalized calculation was made of 5 teeth in each meter of the tape). The program calculated the main parameters of the serrated tape, and also determined the surface roughness at a predetermined base length. Surface profilogram

a piece of serrated tape (at the required scale), as well as the ideal contour of the headset, are printed on graph paper using a printer. If necessary, the calculation data and the image of the headset kongur can be stored in the computer memory.

1. Yakushev A.I. et al. Interchangeability, standardization and technical measurements: Textbook for technical colleges / A.I. Yakushev, L.N. Vorontsov, N.M. Fedotov.-6th ed., Rev. and additional.- M .: Mechanical Engineering, 1987., p. 199-203, ill.

2. German patent No. 4115534, cl. G 01 D5 / 26, published 1994 (application No. 47 of 11/19/1992).

Authors: :. .Khripunov S.N. Merkulova T.A. Pavlov Yu.V. (B

Claims (1)

A device for assessing surface roughness and determining the geometric parameters of all-metal serrated tapes (headsets), containing a matrix photosensitive surface, characterized in that, in order to improve the accuracy of determining the basic geometric parameters and surface condition of the headsets, reduce time and automate the processing of measurement results, the output is photosensitive matrix using an analog-to-digital Converter, a digital signal is formed, which is processed using special programs on a computer.